Charging member, process cartridge and electrophotographic apparatus

Active Publication Date: 2011-07-28
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]According to the present invention, a charging member having a charging performance which is resistant to change even after long-term use, and being excellent in durability can be provided. This is considered to be because the surface layer of the charging member according to the present invention has been reinforced by silsesqui

Problems solved by technology

According to an investigation by the present inventors, it was found that the conductive roll disclosed in Japanese Patent Application Laid-Open No. 2001-173

Method used

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  • Charging member, process cartridge and electrophotographic apparatus
  • Charging member, process cartridge and electrophotographic apparatus
  • Charging member, process cartridge and electrophotographic apparatus

Examples

Experimental program
Comparison scheme
Effect test

Example

Synthesis Example 1

[0133]To a reaction container provided with a stirrer, a dripping funnel and a thermometer, 120 ml of 2-propanol (hereinafter referred to as IPA) was added as a solvent, and 9.40 g of an aqueous solution of 5% tetramethylammonium hydroxide (hereinafter referred to as TMAH aqueous solution) was added as a basic catalyst. Into the dripping funnel, 45 ml of IPA and 0.150 mol (31.56 g) of a starting material 1 represented by the following Formula (15) were charged, and the mixture was added dropwise at room temperature for 30 minutes while the reaction solution was stirred. After the addition was finished, the solution was stirred for 2 hours without being heated. After the aqueous solution was stirred for 2 hours, the solvent was removed under reduced pressure, and then 250 ml of toluene was added into the reaction container to dissolve the content therein. The toluene solution of the content was washed with saturated saline until the solution was neutralized, and th...

Example

Comparative Example 1

[0165]A solution C1 which contained a condensate of the hydrolyzable silane compound was obtained by mixing the raw materials shown in the following Table 7, stirring the mixture at room temperature, and heating the stirred mixture under reflux for 24 hours (100° C.) After that, a charging roller C1 was obtained similarly to Exemplary Embodiment 1 except that the surface layer was formed by thermal-curing the condensate C1 at 160° C. for 1 hour, and the physical properties were measured.

TABLE 7Phenyltriethoxysilane (PhTES)56.25 g (0.234 mol)Hexyltrimethoxysilane (HeTMS)13.21 g (0.064 mol)Tridecafluoro-1,1,2,2-tetrahydro11.23 g (0.022 mol)octyltriethoxysilane (FTS, number of carbonatoms in perfluoroalkyl group = 6)Water25.93 gEthanol61.50 g

Example

Comparative Example 2

[0166]A charging roller C2 was obtained similarly to Exemplary Embodiment 1 except that 0.5 parts by mass of a silica filler (trade name: ADMAFINE made by Admatechs Company Limited, mean particle size=1.0 specific surface area=3.6 m2 / g) to the condensate-containing solution C1 used in Comparative Example 1, and the physical properties were measured.

[0167]Measurement of Physical Properties of Charging Roller

[0168]The physical properties of the charging roller of the above described Exemplary Embodiments and Comparative Examples were measured with the method described below.

[0169](1) Modulus of Elasticity of Surface Layer;

[0170]The modulus of the elasticity of the surface layer of a charging roller was measured by using a surface-film physical-property testing instrument (trade name: “FISCHERSCOPE H100V”, made by Fischer Instruments K.K.). The modulus of elasticity was determined to be the value measured when the indenter was made to ingress into the surface of a ...

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Abstract

The present invention provides a charging member which can maintain excellent wear resistance even though being used repeatedly. In the charging member having a surface layer, the surface layer is a surface layer constituted by at least one selected from silsesquioxanes having structures represented by a compound (1), a compound (2), a compound (3), a compound (4), a compound (5) and a compound (6), and a polysiloxane having a first unit represented by SiO0.5R1(OR2)(OR3), a second unit represented by SiO1.0R4(OR5) and a third unit represented by SiO1.5R6, wherein the silsesquioxane is contained in the polysiloxane.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / JP2010 / 007136, filed Dec. 8, 2010, which claims the benefit of Japanese Patent Application No. 2009-282694, filed Dec. 14, 2009.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a charging member which is used in an electrophotographic apparatus, a process cartridge, and the electrophotographic apparatus.[0004]2. Description of the Related Art[0005]In an electrophotographic apparatus, a charging member (hereinafter also referred to as a “charging roller”) which comes into contact with the surface of an electrophotographic photosensitive member and has a roller shape for charging the surface of the electrophotographic photosensitive member generally has an elastic layer containing a resin. Such a charging roller can sufficiently secure a nip width between the charging roller and the electrophotographic photosensitive membe...

Claims

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Application Information

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IPC IPC(8): G03G15/02G03G21/18
CPCG03G15/0233C08L83/04F16C13/00G03G15/02
Inventor KURUMA, YOKOKURODA, NORIAKINAGAMINE, NORIKO
Owner CANON KK
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